I try it again.
I also check the ohci driver. I think the current ohci driver
should be able to handle >4K buffers.
>From usb-ohci.c:
case PIPE_CONTROL: /* 1 TD for setup, 1 for ACK and 1 for every 4096 B */
size = (urb->transfer_buffer_length == 0)? 2:
(urb->transfer_buffer_length - 1) / 4096 + 3;
break;
Then it will allocate "size" number of TDs.
Do I miss anything?
Thanks
Chris
===== devio.c 1.9 vs edited =====
--- 1.9/drivers/usb/devio.c Thu Apr 18 05:34:31 2002
+++ edited/devio.c Wed Feb 5 03:59:57 2003
@@ -800,7 +800,7 @@
return -EINVAL;
}
/* min 8 byte setup packet, max arbitrary */
- if (uurb.buffer_length < 8 || uurb.buffer_length > PAGE_SIZE)
+ if (uurb.buffer_length < 8 || uurb.buffer_length > 64*1024)
return -EINVAL;
if (!(dr = kmalloc(sizeof(devrequest), GFP_KERNEL)))
return -ENOMEM;
On Wed, Feb 05, 2003 at 10:54:22AM +0100, Oliver Neukum wrote:
> Am Dienstag, 4. Februar 2003 19:23 schrieb Christopher Li:
> > I just did the modify as you said and patch VMware as well.
> > And that scanner works fine now.
> >
> > Will you take this patch?
>
> You need to ask Greg. But even if it were mine to decide, I wouldn't.
> If you want to test for 64K, do so. 16*PAGE_SIZE may be anything.
>
> Regards
> OLiver
>
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